WO2003012978A1 - Circuit de detection am - Google Patents
Circuit de detection am Download PDFInfo
- Publication number
- WO2003012978A1 WO2003012978A1 PCT/JP2002/006553 JP0206553W WO03012978A1 WO 2003012978 A1 WO2003012978 A1 WO 2003012978A1 JP 0206553 W JP0206553 W JP 0206553W WO 03012978 A1 WO03012978 A1 WO 03012978A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit
- capacitor
- detection circuit
- carrier
- constant current
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/14—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles
- H03D1/18—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles of semiconductor devices
Definitions
- the present invention relates to an AM detection circuit used for an AM radio, a television receiver, or the like.
- a general AM receiver employing the superheterodyne method performs high-frequency amplification on an AM modulated wave signal received via an antenna, and then performs frequency conversion using a frequency mixing circuit, thereby obtaining an intermediate frequency having a predetermined frequency. After converting to a signal, AM detection processing is performed.
- FIG. 3 is a diagram showing a configuration of a conventional AM detection circuit.
- the AM detection circuit 90 shown in FIG. 3 includes a half-wave rectification circuit 92 and a carrier removal circuit 94 including a resistor 96 and a capacitor 98. After the input AM modulated wave signal is subjected to half-wave rectification by the half-wave rectifier circuit 92, the carrier component is removed by the carrier removal circuit 94.
- the present invention has been made in view of such a point, and an object of the present invention is to provide an AM detection circuit that can be integrally formed on a semiconductor substrate.
- an AM detection circuit includes a rectifier that rectifies an input AM modulated signal, and a carrier wave component included in the signal rectified by the rectifier.
- the carrier removing means includes a capacitor charged by the output voltage of the rectifying means, and a constant current circuit for discharging the capacitor when the output voltage of the rectifying means becomes lower than the terminal voltage of the capacitor. Since the capacitor can be discharged by a very small current generated by the constant current circuit, even if a capacitor with a small capacitance is used, its terminal voltage can be gradually reduced.
- the entire AM detection circuit including the carrier removal means can be formed on a semiconductor substrate.
- the above-mentioned carrier wave removing means further includes a high input impedance output buffer for extracting a terminal voltage of the capacitor.
- the capacitor can be discharged only by the minute current generated by the constant current circuit, so that the combination of the capacitor and the constant current circuit can be reliably operated as a single-pass filter. .
- FIG. 1 is a diagram showing a configuration of an AM receiver according to an embodiment
- FIG. 2 is a circuit diagram showing the detailed configuration of the AM detection circuit.
- FIG. 3 is a diagram showing a configuration of a conventional AM detection circuit.
- FIG. 1 is a diagram illustrating a configuration of an AM receiver according to one embodiment.
- the AM receiver according to the present embodiment includes a high-frequency amplifier circuit 11, a mixing circuit 12, a local oscillator 13, an intermediate frequency filter 14, 16, an intermediate frequency amplifier circuit 15, an AM detection circuit 17 It is comprised including.
- the high-frequency signal is converted into the intermediate frequency signal by mixing the local oscillation signal output from the local oscillator 13.
- the frequency of the amplified AM modulated wave signal output from the high-frequency amplifier circuit 11 is f 1 and the frequency of the local oscillation signal output from the local oscillator 13 is f 2, f
- An intermediate frequency signal having a frequency of f2 is output.
- the intermediate frequency filters 14, 16 are provided before and after the intermediate frequency amplification circuit 15, and extract a frequency component included in the occupied frequency bandwidth of the modulated wave signal from the input intermediate frequency signal.
- the intermediate frequency amplification circuit 15 amplifies the intermediate frequency signal.
- the AM detection circuit 17 performs an AM detection process on the intermediate frequency signal amplified by the intermediate frequency amplification circuit 15.
- FIG. 2 is a circuit diagram showing a detailed configuration of the AM detection circuit 17.
- the AM detection circuit 17 of the present embodiment includes a rectifier circuit 100, a carrier removal circuit 110, and an output buffer 120.
- the rectification circuit 100 When an intermediate frequency signal is input to the AM detection circuit 17 from the preceding intermediate frequency filter 16, the rectification circuit 100 performs half-wave rectification on the intermediate frequency signal.
- the signal output from the rectifier circuit 100 contains a carrier component, and the carrier elimination circuit 110 removes the carrier component from the output signal of the rectifier circuit 100.
- the output buffer 120 has a high input impedance.
- the signal generated by the carrier removal circuit 110 is output to the outside of the AM detection circuit 17 via the output buffer 120 having the high input impedance.
- the rectifier circuit 100 includes transistors 21 to 27, current sources 30 and 31, resistors 40 and 41, and capacitors 50 and 51.
- Transistors 24 and 25 perform differential operation, and only the AC component of the AM modulated wave signal input to rectifier circuit 100 is input to the gate of one transistor 24 via capacitor 50. that the gate of the c other transistor 2 5 is AC grounded with capacitor 5 1.
- a voltage (Vdd / 2) of about half of the power supply voltage Vdd is applied to each gate of these two transistors 24 and 25 as a bias voltage.
- Vdd / 2 the AC component of the AM modulated wave component is input to only one of the transistors 24 performing the differential amplification operation, and the other transistor 25 is grounded in an AC manner.
- the carrier removal circuit 110 includes transistors 28 and 29, a current source 32, and a capacitor 52.
- the transistors 28 and 29 and the current source 32 form a constant current circuit of a current mirror. This constant current circuit is connected in parallel with the capacitor 52, and generates a discharge current when the capacitor 52 is discharged.
- the carrier removal circuit 110 included in the AM detection circuit 17 uses the small current generated by the constant current circuit based on the current mirror to control the carrier. Since the capacitor 52 can be discharged, the terminal voltage of the capacitor 52 can be gradually reduced even when the capacitor 52 having a small capacitance is used. Therefore, by combining the capacitor 52 and the constant current circuit, it is possible to operate as a single-pass filter, and to remove the carrier component contained in the AM modulated signal. Moreover, since the capacitance of the capacitor 52 can be reduced, the entire AM detection circuit 17 including the carrier removal circuit 110 can be formed on the semiconductor substrate.
- the capacitor 52 can be discharged only by the minute current generated by the constant current circuit, so that the combination of the capacitor 52 and the constant current circuit can be used. It will be possible to operate as a mouth-to-pass filter without fail.
- the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.
- the case where the AM detection circuit 17 is formed on the semiconductor substrate has been described.
- other configurations such as the high-frequency amplification circuit 11 and the mixing circuit 12
- the entire structure including the semiconductor device may be formed on a semiconductor substrate.
- a capacitor can be discharged by a very small current generated by a constant current circuit, even when a capacitor having a small capacitance is used, its terminal voltage is gradually reduced. Can be reduced. Therefore, by combining a capacitor and a constant current circuit, it can be operated as a single-pass filter, and the carrier wave component contained in the AM modulated wave signal can be removed. Moreover, it is possible to reduce the capacitance of the capacitor, it is possible to form the entire AM detection circuit including a carrier wave removal unit on a semiconductor substrate c
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuits Of Receivers In General (AREA)
- Superheterodyne Receivers (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/484,593 US20040196097A1 (en) | 2001-07-30 | 2002-06-28 | Am detection circuit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001229647A JP2003046339A (ja) | 2001-07-30 | 2001-07-30 | Am検波回路 |
JP2001-229647 | 2001-07-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003012978A1 true WO2003012978A1 (fr) | 2003-02-13 |
Family
ID=19061966
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/006553 WO2003012978A1 (fr) | 2001-07-30 | 2002-06-28 | Circuit de detection am |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040196097A1 (ja) |
JP (1) | JP2003046339A (ja) |
TW (1) | TW556415B (ja) |
WO (1) | WO2003012978A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005318300A (ja) * | 2004-04-28 | 2005-11-10 | Sony Corp | 逓倍回路、発振回路、および無線通信装置 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10306689A1 (de) * | 2003-02-11 | 2004-08-19 | Atmel Germany Gmbh | Schaltungsanordnung zur Signaldetektion |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5684030A (en) * | 1979-12-12 | 1981-07-09 | Fujitsu Ltd | Peak detecting circuit |
JPS59156005A (ja) * | 1983-02-24 | 1984-09-05 | Rohm Co Ltd | 高周波検波出力回路用増幅回路 |
JPH0212671U (ja) * | 1988-07-08 | 1990-01-26 | ||
JPH07249941A (ja) * | 1994-03-10 | 1995-09-26 | Toshiba Corp | シグマエンベロープ検出回路 |
JP2002009553A (ja) * | 2000-06-19 | 2002-01-11 | Matsushita Electric Ind Co Ltd | 検波回路 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02145003A (ja) * | 1988-11-28 | 1990-06-04 | Toshiba Corp | 検波回路 |
US5656834A (en) * | 1994-09-19 | 1997-08-12 | Philips Electronics North America Corporation | IC standard cell designed with embedded capacitors |
EP1067662B1 (en) * | 1999-07-05 | 2004-10-06 | STMicroelectronics S.r.l. | CMOS Syncronous rectifier circuit for step-up devices |
-
2001
- 2001-07-30 JP JP2001229647A patent/JP2003046339A/ja active Pending
-
2002
- 2002-06-28 WO PCT/JP2002/006553 patent/WO2003012978A1/ja active Application Filing
- 2002-06-28 US US10/484,593 patent/US20040196097A1/en not_active Abandoned
- 2002-07-29 TW TW091116888A patent/TW556415B/zh not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5684030A (en) * | 1979-12-12 | 1981-07-09 | Fujitsu Ltd | Peak detecting circuit |
JPS59156005A (ja) * | 1983-02-24 | 1984-09-05 | Rohm Co Ltd | 高周波検波出力回路用増幅回路 |
JPH0212671U (ja) * | 1988-07-08 | 1990-01-26 | ||
JPH07249941A (ja) * | 1994-03-10 | 1995-09-26 | Toshiba Corp | シグマエンベロープ検出回路 |
JP2002009553A (ja) * | 2000-06-19 | 2002-01-11 | Matsushita Electric Ind Co Ltd | 検波回路 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005318300A (ja) * | 2004-04-28 | 2005-11-10 | Sony Corp | 逓倍回路、発振回路、および無線通信装置 |
Also Published As
Publication number | Publication date |
---|---|
JP2003046339A (ja) | 2003-02-14 |
US20040196097A1 (en) | 2004-10-07 |
TW556415B (en) | 2003-10-01 |
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